package filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 * Servlet Filter implementation class PrivilegeFilter
 */
public class PrivilegeFilter implements Filter {

    /**
     * Default constructor. 
     */
    public PrivilegeFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		Cookie[] cookies = ((HttpServletRequest)request).getCookies();
		HttpSession session = ((HttpServletRequest)request).getSession();
		String value = (String) session.getAttribute("login");
		String path = ((HttpServletRequest)request).getContextPath();
		
		if(null==cookies){
			((HttpServletResponse)response).sendRedirect(path+"/login");
			return;
		}
		
		for(Cookie coo:cookies){
			if(coo.getName().equals("login")){
				if(coo.getValue().equals(value)){
					chain.doFilter(request, response);
					return;
				}
			}
		}
		((HttpServletResponse)response).sendRedirect(path+"/login");
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
